python3: use six.class_types to check for classes (#36516)

wcs/monkeypatch.py

@@ -17,6 +17,7 @@
 import threading
 import types
 
+from django.utils import six
 from django.utils.six.moves.urllib import parse as urlparse
 
 import quixote
@@ -88,7 +89,7 @@ def cleanup():
     _thread_local.publisher = None
 
 
-for key, value in locals().items():
-    if type(value) in (types.FunctionType, types.TypeType, types.ClassType):
+for key, value in list(locals().items()):
+    if type(value) in (types.FunctionType,) + six.class_types:
         setattr(quixote, key, value)
         setattr(quixote.publish, key, value)